Video content with displays that use HDCP may experience graphics corruption on certain NVIDIA GPUs

Enabling display rotation causes kernel panic on certain NVIDIA GPUs

Signing into Setup Assistant with your AppleID does not sign you into iCloud

NSDocument-based applications which use auto-save & iCloud entitlements will be opted into the new Document Library automatically. The option to disable this is not currently available

Kernel, kexts, and zones are now based at unpredictable addresses at each boot. The addresses in the kernel symbol table are unslid, and will not accurately reflect a running system. Provided that Xcode 4.4 gdb is used, KASLR is transparent to kernel debugging

To temporarily disable KASLR, set “slide=0” in the boot-args

Panics may occur when a Port Multiplier or PCI eSATA drive is attached

While booted into the Recovery Partition, you may be unable to connect to WiFi networks

Safari does not function in the Recovery Partition

Restoring from network backups in the Recovery Partition may fail

Foor me, the most troublesome part of Mountain Lion has been its new Messages app, which essentially a re-skinned version of iChat that has iMessage support and a few more bells and whistles. It has been incredibly buggy for me in daily use. Here’s hoping that the latest version is just a bit better. It has to get significantly more reliable before Mountain Lion hits the market, that’s for sure.

Developers can download the new release from the Apple Developer Center directly by redeeming a code via the Mac App Store. At this point it does not appear as an update in the store automatically. You can see our rundown of the major new features of Mountain Lion here.